BEHR® DECKPLUS™ TRANSPARENT WATERPROOFING WOOD FINISH No. 400 gives wood the protection it needs while still showcasing its full natural beauty. This 100% acrylic formula seals out water and blocks the sun's harmful UV rays for up totwo years on decks and up to four years on fences and siding. It's available in 3 pre-mixed colors, so you can get the look you want while preserving your valuable investment.